Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f4aa9d4222260f…

MALICIOUS

PDF

75.1 KB Created: 2021-04-05 23:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda67492ccfe7165f163fab7a852de1e SHA-1: 7a287cd5dad245f6188f3dd0a3b1d2db4f36f45b SHA-256: 40f4aa9d4222260ff99a08c5b8f7b3eba9b588131664263e638afca8cdb80b47
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'dafemum.ru', which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/123?utm_term=fraction+to+decimal+to+percent+worksheet+table
    • https://cdn.sqhk.co/zivuputid/9XKUNu0/learn_english_conversation_app_download.pdf
    • https://cdn.sqhk.co/difanemifal/0UXMnkR/13250096201.pdf
    • https://cdn-cms.f-static.net/uploads/4417212/normal_6067a2c9e115d.pdf
    • https://cdn-cms.f-static.net/uploads/4457847/normal_60117c0231a60.pdf
    • https://cdn-cms.f-static.net/uploads/4426974/normal_602ba23792876.pdf
    • https://cdn.sqhk.co/tefozakozup/xDdeiiS/schoolsfirst_fcu_mobile_banking.pdf
    • https://cdn.sqhk.co/fusajovogi/jexiajI/political_lobbying_definition_economics.pdf
    • https://cdn.sqhk.co/nowonipewo/hQBwjil/34343286710.pdf
    • https://cdn.sqhk.co/fexivijemozu/WwgcJeq/proper_use_of_ironing_board.pdf
    • https://cdn.sqhk.co/vumojakizaw/82hbglr/descargar_libro_aura.pdf
    • https://cdn.sqhk.co/kajipazuto/hjia4je/barbershop_vs_hair_salon.pdf
    • https://cdn.sqhk.co/kobewudojuvo/Igijjia/luperawesinazuguxipus.pdf
    • https://cdn.sqhk.co/xumesapaxoku/gjbiirC/space_shooter_gift_codes_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6047f053a26f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jiwisi/call_of_cthulhu_roleplaying_game_reddit.pdf
    • https://s3.amazonaws.com/pafiganovavi/82929131702.pdf
    • http://zetusemikaso.rf.gd/tovupijemonevawaxebep.pdf
    • http://gilasorizarer.rf.gd/mixuxorezuwu.pdf
    • https://s3.amazonaws.com/firudegix/general_electric_company_annual_report_2019.pdf
    • http://luzirilokupozar.rf.gd/vavidilotuwesibarome.pdf
    • http://bexituxupogetav.rf.gd/namafot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1e.bin
253586262504af6cf7ad9d7a0c02fb30d0e8774225ca426631f292b624c7a767		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 5352 bytes
font_01_sfnt_off0000ed21.bin
a66d9656b028225402f6cd4447efa966a9398817ce484ec6ca63ac1029adc09a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 10388 bytes
font_02_sfnt_off000110c7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 4324 bytes

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